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II <br /> A S S O C I A T E S I N C <br /> 22=5 Monitoring Well DeveIoument <br /> 1 <br /> Newly installed groundwater monitoring wells MW4, 1I and MW7 were developed on March <br /> 1 27, 1998 Each well was purged until the extracted water was relatively sediment free The air <br /> lift submersible pump used for well development became lodged in well MW5 on March 27, <br /> 1998 In an attempt to remove the pump, the discharge line broke a few feet below the top of the <br /> ' well casing On June 26, 1998, after several previous attempts to remove the pump, the discharge <br /> line was broken off at a location near the top of the air lift submersible pump and removed The <br /> ' submersible pump is 6a6jthe bottom of the well, and will be removed at a future date This <br /> allowed well MW5 to be developed and sampled during the second quarter 1998 monitoring <br /> event and analytical results will be incorporated into that report Development/purge logs are <br /> 1 included in Appendix D Purgewater was temporarily stored on site in 55-gallon drums and <br /> disposed of on May 29, 1998 by Evergreen Environmental Services The non-RCRA hazardous <br /> 1 waste manifest is contained in Attachment G <br /> 2.6 Fluid Level Measurement/Surveying <br /> After fluid levels had been allowed to stabilize, groundwater levels were obtained from wells <br /> ' MW 1 through MW7 and the additional on-site well designated CW Fluid levels were taken on <br /> March 26, 1998, utilizing an electronic water probe capable of measuring with an accuracy of <br /> 1/100 of a foot The new wells were surveyed on March 27, 1998 and tied into the existing <br /> ' monitonng wells Groundwater elevation data are presented in Table 2 <br /> ' 2_7 Groundwater Sampling and AnaLsis <br /> On March 26 and 27, 1998, groundwater samples were collected from wells MW 1, MW2, MW3, <br /> ' MW4, MW6, MW7, and CW The samples were collected after purging a minimum of three well <br /> volumes and stabilization of electric conductivity, pH, and temperature Field development/purge <br /> 1 logs are presented in Appendix D <br /> Subsequent to purging, groundwater was sampled and transferred to appropriate sample <br /> 1 containers, using clean, disposable bailers with bottom emptying devices to reduce volatilization <br /> Sample containers were then labeled with sample identification, placed on ice, and shipped under <br /> chain-of-custody to AEN <br /> The groundwater samples from wells MW4, MW6, and MW7 were analyzed by AEN for TPHg, <br /> BTEX, oxygenate fuel additives, and total lead The groundwater samples from wells MWI, <br /> w w2596\rq)ortS\*Lpsi aw 4 <br />